DC connector

The DC connector (DC plug or socket) is an electrical connector for supplying DC (direct current) power. Compared to domestic AC power plugs and sockets, DC connectors have many more standard types that are not widely interchangeable. Types vary from small coaxial barrel connectors used to power portable electronic devices from AC adapters (aka wall warts), to crimp or solder connectors]] more usually used for automotive accessories.

When making DC connections care should be taken to ensure correct polarity. Standards can differ between manufacturers, where one will have a connector sleeve for ground, another will use the sleeve for the postive voltage. One convention, widely used, is the ground wire is insulated in black while the positive in red.